Comment by kevinmchugh

My uninformed impression is that Tumblr users were relatively unique in how freely they mixed pornography consumption and non porno. There are some Twitter users who do this, but Twitter is public enough that most people are wary of doing that or get caught by follows, likes being public. My anecdotal experience is that I don't see porno comments or submissions from most reddit users either, but that's obviously skewed by the reddits I'm in.

I also know that Tumblr has norms against "horny on main", so maybe Tumblr users were very diligent about using alts and the other sites make that too frictional